The global scripts and styles can be overridden on the specific pages as well. For that you will specify the same handle name.
Also, you can use async option for css to eliminate the issue of render blocking css. This should be used with caution though, since it may result into FOUC (flash of unstyled content).
- Place the unzipped plugin folder into the wp-content/plugins/ folder.
- Activate the plugin from wp-admin -> plugins section.
- You will see the WP Enqueue Manager in each page and posts. Also, there is global setting available under WP Enqueue Manager section in the sidebar of admin panel.
Note that the page must have used wp_footer() function which normally is the case in most themes.